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Cloud shape of a molecular Bose–Einstein condensate in a disordered trap: a case study of the dirty boson problem

  • We investigate, both experimentally and theoretically, the static geometric properties of a harmonically trapped Bose–Einstein condensate of 6Li2 molecules in laser speckle potentials. Experimentally, we measure the in situ column density profiles and the corresponding transverse cloud widths over many laser speckle realizations. We compare the measured widths with a theory that is non-perturbative with respect to the disorder and includes quantum fluctuations. Importantly, for small disorder strengths we find quantitative agreement with the perturbative approach of Huang and Meng, which is based on Bogoliubov theory. For strong disorder our theory perfectly reproduces the geometric mean of the measured transverse widths. However, we also observe a systematic deviation of the individual measured widths from the theoretically predicted ones. In fact, the measured cloud aspect ratio monotonously decreases with increasing disorder strength, while the theory yields a constant ratio. We attribute this discrepancy to the utilized local density approximation, whose possible failure for strong disorder suggests a potential future improvement.
Author:Benjamin NaglerORCiD, Milan RadonjicORCiD, Sian Cardoso Barbosa, Jennifer Koch, Axel PelsterORCiD, Artur WideraORCiD
URN (permanent link):urn:nbn:de:hbz:386-kluedo-60532
Parent Title (English):New Journal of Physics (NJP)
Document Type:Article
Language of publication:English
Publication Date:2020/03/19
Year of Publication:2020
Publishing Institute:Technische Universität Kaiserslautern
Date of the Publication (Server):2020/08/25
Issue:2020, 22
Number of page:15
Faculties / Organisational entities:Fachbereich Physik
DDC-Cassification:5 Naturwissenschaften und Mathematik / 530 Physik
Licence (German):Zweitveröffentlichung